U LUZ

lucas makes a good injector the 42.5 and ford makes a 42 which would you go with?????

MIGHTYMOUSE

iTrader: (59)

seems like more people have made more power with the ford 42's and have had no tuning trouble to speak of

cablebandit

iTrader: (37)

Ford!!

smokinHawk

iTrader: (48)

since the fords are rated at a lower pressure they supply more fuel with the higher presuure ls1

so get the ford injector

U LUZ

im going to thanks alot..................

slow

iTrader: (7)

what are the fords and lucas rated at?

I had assumed they were both at 3 bar, with the fords possibly at 39vs the conventional 42

Ryan

samz28

this is simple. Go ask RC Engineering why they use lucas. They do have a reason.

Well there's one reason. The pintle on the lucas are up to 10X lighter than the bosch 42# injectors (lime green/orange svt).

What does this do? Allows them to respond faster at idle where minimum injector pulse time is crucial to clean idle, and from 0-85% (non static) they can deliver a better slope on fuel. THEY DONOT deliever the same amount of fuel as bosch from 0-85% once they go static at 85% they are the rated amount. Since you want to avoid static, you buy big injectors (duh).

So you'll get better idle/low load.

Now here's the catch. The injector pintle being lighter is more susceptible to improper use. Bosch rates their injectors at 5 bar rail pressure (5*14.7). Rail pressure includes boost so if you run 1bar (14.7psi) + 4bar base you're on the redline of the injector.

The lighter pintle of the lucas (and siemens/deka style) will result inability to overdrive the fuel pressure and keep the injector pintle from collapsing. Nobody knows where but the idiots that run Rising rates and jack up the fuel rail pressure to stupid limits will want to avoid the lucas injectors since they are more prone to these high rail pressure limits.

The problem goes down to flow, if you picked the injector, you picked it to use at low pressure or "nominal pressure" not high pressure, otherwise you'd pick a motortron 60# injector and run less pressure.

Both injectors are rated at 3bar 440cc @ 100% duty cycle. Both injectors will BEHAVE differently from .1% to 85% (static), you will get more response and fuel out of the lucas design, unless you push them over their recommended rail pressure.

if you have any more questions, feel free to call up rc engineering, or look at their website. they are quite knowledgable and would be glad to explain in more technical terms. I'm not a physics major but have been working with efi for a while.

I prefer the lucas/siemens-deka pintle style used within their proper range, at high flow rates they just open faster giving better idle/low load/emissions when you put huge injectors that are saturated style on a car that wasn't designed for them.

slow

iTrader: (7)

question on why running a rising rate regulator is stupid, provided its 1:1

boost, on the stock fuel system, decreases rail/intake differential, and makes knowing the exact size of the injector hard.

rising rate, or vac/boost referenced, solves this.

Or do you consider rising rate, to be FMU style 4:1, ect. if so, i agree 10000000& that is it stupid.Just wondering if your comment about rising rate, was directed at all vac/boost referenced setups, or just FMU style setups.

Ryan.

samz28

I think running more than the recommended bar rating from the injector manufacturer to be dangerous in critical applications. The lucas injectors are prone to lockup at high pressures more so than the bosch old style.

Yah most people consider rising rate fpr's more than 1:1, since most cars (even today) come with 1:1 stock lol.

i could see 1bar max over 4bar fpr, with a good fuel pump to hold that at the flow rates you desire. but then i'd probably pick the bosch.

if it was 1bar max boost over 3bar fpr, i'd consider the lucas.

slow

iTrader: (7)

agreed, but we don't have a 1:1 stock thats why i was wondering.

Ryan.

samz28

yeah im sorry i've been used to working with cars with this 1:1 gain/loss for so long i forget about it. It never made sense to me since the 1:1 gain/loss always let the cpu do other things than scale fuel

Team ZR-1

The injectors are NOT made by ford, they are Bosch as what stock ones are.
ford only had these spec'd for the SVO's that race.

The SV0 30 also works with the same stock injector offset times
I have used them on well over 200 F and Y bodies and some have been installed for over 3 years with no problems.

Lucas do not spray as well at higher ON times so stick with the Bosch

samz28

yeh but if you're over 85% duty cycle you've got too small injectors..werd.

U LUZ

i think im going with the ford 42,5s they are easy to find and a lot of people use them....

stevieturbo

Surely although rail pressure on a boosted engine, say 4bar static+1bar boost.
The pressure difference across the injector is still only 4 bar ?? as the inlet side of the injector sees 1 bar pressure pushing agaisnt the incoming fuel.

BTW, Im using Ford motorsport 42lb's on my twin turbo rover V8, and they seem to work perfectly. I have about 500bhp.
using 3.5bar static fp with an aeromotive reg. and 1 bar boost pressure.

U LUZ

samz28

with 4bar static + 1bar boost with no gain = 4bar @0bar and 3bar @1bar.

if you use a 1:1 gain fpr you get a 5bar rail but 4bar@0bar and 4bar@1bar which is easier to program since equalization is does mechanically.

depends on your ecu and how you tune it.

99Fbody99

RC/Lucas Injectors suck IMHO..Period. Very poor low speed pulse width spray control on them. They can be a nightmare, including crank. I have done plenty of sets of both, and will never use Lucas again. Do a search in the mustang world on corral. On ford you also have crank injector pulse width vs coolant temp (not avail with ls1 edit) and still have issues.
The Bosch green tops have a very similar injector flow slope as the originals, that make them very easy for most to tune.

Dave